CN106751724A - Electromagnetic shielding cobalt sulfide material and preparation method thereof - Google Patents
Electromagnetic shielding cobalt sulfide material and preparation method thereof Download PDFInfo
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- CN106751724A CN106751724A CN201611181012.4A CN201611181012A CN106751724A CN 106751724 A CN106751724 A CN 106751724A CN 201611181012 A CN201611181012 A CN 201611181012A CN 106751724 A CN106751724 A CN 106751724A
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- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses one kind electromagnetic shielding cobalt sulfide material and preparation method thereof, belong to field of compound material.The method is comprised the following steps：Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, dibutyl phthalate, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after 60~120min of stirring, stand, filtering obtains filtrate；Take out in filtrate placement Muffle furnace, be heated to 300~400 DEG C of 1~1.3h of reaction, cooling；Attrition grinding, sieving, obtains final product.The present invention can be used for ELECTROMAGNETIC RADIATION SHIELDING, because can improve shielding properties through the material after citric acid immersion treatment, the polyurethane resin being modified by the method for the present invention can also improve the shielding properties of material.
Description
Technical field
Cobalt sulfide material and preparation method thereof is electromagnetically shielded the invention belongs to field of compound material, more particularly to one kind.
Background technology
Electromagnetic shielding is used to weaken the measure of the field intensity caused by some sources in certain region of space.In the overwhelming majority
In the case of, shield can be made up of metals such as copper, aluminium, steel, but for constant and ultra low yield point steel, also can be using materials such as ferrites
Material is used as shield.Because shield to from the outside interference electromagnetic wave such as wire, cable, component, circuit or system and
Internal electromagnetic wave plays energy absorption (eddy-current loss), reflected energy (interface reflection of the electromagnetic wave on shield) and offsets
The effect of energy (electromagnetic induction produces reverse electromagnetic field on the shielding layer, can offset part interference electromagnetic wave), so shield
With the function of weakening interference.The 3C Product such as notebook computer, GPS, ADSL and mobile phone all can be because of high-frequency electromagnetic wave interference
Noise is produced, communication quality is influenceed.If another human body is exposed to powerful electromagnetic off field for a long time, cancerous lesion may be susceptible to suffer from.Therefore
Anti- electromagnetic interference has been indispensable and imperative processing procedure.
Cobalt sulfide is the mixture of sulphur cobalt binary compound composition, and chemical formula is considered as CoS.It is by vulcanized sodium and Co2+
Salting liquid reacts, and the CoS compositions that precipitation is obtained are Co (SH, OH)2, amorphous state precipitation is changed into the CoxS (x of crystalline state after placement
＜ 1) and Co9S8 mixture.
The content of the invention
The present invention is in order to solve problem of the prior art, there is provided one kind electromagnetic shielding cobalt sulfide material and its preparation side
Method, using citric acid immersion treatment mode, realizes the raising of shielding properties.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：50~90 parts of cobalt sulfide, cobalt oxide 20~25
Part, 20~25 parts of calcium oxide, 30~50 parts of dodecyl sodium sulfate, 20~30 parts of benzyl triphenyl phosphonium chloride phosphine, barium sulfate 10~
30 parts, 20~60 parts of dibutyl phthalate, 10~40 parts of polyurethane resin, 7~8 parts of vinyl bis-stearamides, boronation
200~300 parts of two 10~30 parts of molybdenums, 20~40 parts of citric acid, 10~15 parts of glucose and water.
Preferably, electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：70 parts of cobalt sulfide, cobalt oxide
22 parts, 22 parts of calcium oxide, 40 parts of dodecyl sodium sulfate, 25 parts of benzyl triphenyl phosphonium chloride phosphine, 20 parts of barium sulfate, phthalic acid
40 parts of dibutyl ester, 25 parts of polyurethane resin, 7.5 parts of vinyl bis-stearamides, 20 parts of two molybdenum of boronation, 30 parts of citric acid, grape
250 parts of 12.5 parts of sugar and water.
Preferably, electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：50 parts of cobalt sulfide, cobalt oxide
20 parts, 20 parts of calcium oxide, 30 parts of dodecyl sodium sulfate, 20 parts of benzyl triphenyl phosphonium chloride phosphine, 10 parts of barium sulfate, phthalic acid
20 parts of dibutyl ester, 10 parts of polyurethane resin, 7 parts of vinyl bis-stearamides, 10 parts of two molybdenum of boronation, 20 parts of citric acid, glucose
10 parts and 200 parts of water.
Preferably, electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：90 parts of cobalt sulfide, cobalt oxide
25 parts, 25 parts of calcium oxide, 50 parts of dodecyl sodium sulfate, 30 parts of benzyl triphenyl phosphonium chloride phosphine, 30 parts of barium sulfate, phthalic acid
60 parts of dibutyl ester, 40 parts of polyurethane resin, 8 parts of vinyl bis-stearamides, 30 parts of two molybdenum of boronation, 40 parts of citric acid, glucose
15 parts and 300 parts of water.
Preferably, the particle diameter of cobalt oxide is 40~80 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after 60~120min of stirring, stand, mistake
Filter, obtains filtrate；
Take out in filtrate placement Muffle furnace, be heated to 300~400 DEG C of 1~1.3h of reaction, cooling；
Attrition grinding, sieving, obtains final product.
Preferably, crossing 200 mesh sieves after crushing.
Preferably, described polyurethane resin is by organic-silicon-modified.
Preferably, the preparation method of modified polyurethane resin is as follows：By PEPA, different Fo Er diisocyanate,
Phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room temperature is cooled to after heating response is complete；Plus
Enter N methyldiethanol amine, be heated to 100~200 DEG C and be down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.
Preferably, described PEPA, different Fo Er diisocyanate, phthalic anhydride, hydroxymethyl cellulose
Sodium, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
The invention has the advantages that：Shield effectiveness of the invention reaches 47~49dB, can be used for electromagnetic radiation
Shielding, because can improve shielding properties through the material after citric acid immersion treatment, is modified by the method for the present invention
Polyurethane resin can also improve the shielding properties of material.
Specific embodiment
The present invention is further described in detail with reference to specific embodiment.
Embodiment 1
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：70 parts of cobalt sulfide, 22 parts of cobalt oxide, oxidation
22 parts of calcium, 40 parts of dodecyl sodium sulfate, 25 parts of benzyl triphenyl phosphonium chloride phosphine, 20 parts of barium sulfate, dibutyl phthalate 40
Part, 25 parts of polyurethane resin, 7.5 parts of vinyl bis-stearamides, 20 parts of two molybdenum of boronation, 30 parts of citric acid, 12.5 parts of glucose
With 250 parts of water.
The particle diameter of cobalt oxide is 60 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 90min, are stood, and filtering is obtained
Filtrate；
Take out in filtrate placement Muffle furnace, be heated to 350 DEG C of reaction 1.15h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
Described polyurethane resin is that by organic-silicon-modified, method is as follows：By PEPA, the isocyanides of different Fo Er bis-
Acid esters, phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room is cooled to after heating response is complete
Temperature；N methyldiethanol amine is added, 110 DEG C is heated to and is down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.Described PEPA, different Fo Er diisocyanate, adjacent benzene
Dicarboxylic acid anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
Embodiment 2
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：50 parts of cobalt sulfide, 20 parts of cobalt oxide, oxidation
20 parts of calcium, 30 parts of dodecyl sodium sulfate, 20 parts of benzyl triphenyl phosphonium chloride phosphine, 10 parts of barium sulfate, dibutyl phthalate 20
Part, 10 parts of polyurethane resin, 7 parts of vinyl bis-stearamides, 10 parts of two molybdenum of boronation, 20 parts of citric acid, 10 parts of glucose and water
200 parts.
The particle diameter of cobalt oxide is 40 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 60min, are stood, and filtering is obtained
Filtrate；
Take out in filtrate placement Muffle furnace, be heated to 300 DEG C of reaction 1h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
Described polyurethane resin is that by organic-silicon-modified, method is as follows：By PEPA, the isocyanides of different Fo Er bis-
Acid esters, phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room is cooled to after heating response is complete
Temperature；N methyldiethanol amine is added, 100 DEG C is heated to and is down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.Described PEPA, different Fo Er diisocyanate, adjacent benzene
Dicarboxylic acid anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
Embodiment 3
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：90 parts of cobalt sulfide, 25 parts of cobalt oxide, oxidation
25 parts of calcium, 50 parts of dodecyl sodium sulfate, 30 parts of benzyl triphenyl phosphonium chloride phosphine, 30 parts of barium sulfate, dibutyl phthalate 60
Part, 40 parts of polyurethane resin, 8 parts of vinyl bis-stearamides, 30 parts of two molybdenum of boronation, 40 parts of citric acid, 15 parts of glucose and water
300 parts.
The particle diameter of cobalt oxide is 80 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 120min, are stood, and filtering is obtained
To filtrate；
Take out in filtrate placement Muffle furnace, be heated to 400 DEG C of reaction 1.3h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
Described polyurethane resin is that by organic-silicon-modified, method is as follows：By PEPA, the isocyanides of different Fo Er bis-
Acid esters, phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room is cooled to after heating response is complete
Temperature；N methyldiethanol amine is added, 200 DEG C is heated to and is down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.Described PEPA, different Fo Er diisocyanate, adjacent benzene
Dicarboxylic acid anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
Embodiment 4
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：80 parts of cobalt sulfide, 20 parts of cobalt oxide, oxidation
20 parts of calcium, 45 parts of dodecyl sodium sulfate, 28 parts of benzyl triphenyl phosphonium chloride phosphine, 25 parts of barium sulfate, dibutyl phthalate 55
Part, 30 parts of polyurethane resin, 7 parts of vinyl bis-stearamides, 25 parts of two molybdenum of boronation, 25 parts of citric acid, 13 parts of glucose and water
260 parts.
The particle diameter of cobalt oxide is 70 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 100min, are stood, and filtering is obtained
To filtrate；
Take out in filtrate placement Muffle furnace, be heated to 370 DEG C of reaction 1.2h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
Described polyurethane resin is that by organic-silicon-modified, method is as follows：By PEPA, the isocyanides of different Fo Er bis-
Acid esters, phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room is cooled to after heating response is complete
Temperature；N methyldiethanol amine is added, 140 DEG C is heated to and is down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.Described PEPA, different Fo Er diisocyanate, adjacent benzene
Dicarboxylic acid anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
Reference examples 1
Difference with embodiment 1 is：Not adding citric acid.
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：70 parts of cobalt sulfide, 22 parts of cobalt oxide, oxidation
22 parts of calcium, 40 parts of dodecyl sodium sulfate, 25 parts of benzyl triphenyl phosphonium chloride phosphine, 20 parts of barium sulfate, dibutyl phthalate 40
250 parts of part, 25 parts of polyurethane resin, 7.5 parts of vinyl bis-stearamides, 20 parts of two molybdenum of boronation, 12.5 parts of glucose and water.
The particle diameter of cobalt oxide is 60 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Glucose is added to the water, is placed on magnetic stirring apparatus and is stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 90min, are stood, and filtering is obtained
Filtrate；
Take out in filtrate placement Muffle furnace, be heated to 350 DEG C of reaction 1.15h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
Described polyurethane resin is that by organic-silicon-modified, method is as follows：By PEPA, the isocyanides of different Fo Er bis-
Acid esters, phthalic anhydride, sodium cellulose glycolate and hydroxy silicon oil are placed in reactor, and room is cooled to after heating response is complete
Temperature；N methyldiethanol amine is added, 110 DEG C is heated to and is down to room temperature, add glacial acetic acid to neutralize, add acetone dilution, vacuum
Organic silicon modified polyurethane resin is obtained final product after extracting acetone solvent.Described PEPA, different Fo Er diisocyanate, adjacent benzene
Dicarboxylic acid anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine mass ratio are 1：3：5：1：6：3.
Reference examples 2
Difference with embodiment 2 is：Using common polyurethane resin.
Electromagnetic shielding cobalt sulfide material, including following weight portion meter raw material：50 parts of cobalt sulfide, 20 parts of cobalt oxide, oxidation
20 parts of calcium, 30 parts of dodecyl sodium sulfate, 20 parts of benzyl triphenyl phosphonium chloride phosphine, 10 parts of barium sulfate, dibutyl phthalate 20
Part, 10 parts of polyurethane resin, 7 parts of vinyl bis-stearamides, 10 parts of two molybdenum of boronation, 20 parts of citric acid, 10 parts of glucose and water
200 parts.
The particle diameter of cobalt oxide is 40 microns.
The preparation method of cobalt sulfide material is electromagnetically shielded, is comprised the following steps：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, adjacent benzene
Dibutyl carboxylic acid, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after stirring 60min, are stood, and filtering is obtained
Filtrate；
Take out in filtrate placement Muffle furnace, be heated to 300 DEG C of reaction 1h, cooling；
Attrition grinding, crosses 200 mesh sieves, obtains final product.
The material is made the thin slice that thickness is 1mm, its shielding properties is surveyed：
| Shield effectiveness dB | |
| Embodiment 1 | 49 |
| Embodiment 2 | 48 |
| Embodiment 3 | 47 |
| Embodiment 4 | 49 |
| Reference examples 1 | 33 |
| Reference examples 2 | 41 |
As can be seen from the table, shield effectiveness of the invention reaches 47~49dB, can be used for ELECTROMAGNETIC RADIATION SHIELDING, explanation
Shielding properties can be improved through the material after citric acid immersion treatment, the polyurethane resin being modified by the method for the present invention also may be used
To improve the shielding properties of material.
The above, preferably specific embodiment only of the invention, protection scope of the present invention not limited to this are any ripe
Those skilled in the art are known in the technical scope of present disclosure, the letter of the technical scheme that can be become apparent to
Altered or equivalence replacement are each fallen within protection scope of the present invention.
Claims (10)
1. cobalt sulfide material is electromagnetically shielded, it is characterised in that the raw material including following weight portion meter：50~90 parts of cobalt sulfide, oxygen
Change 20~25 parts of cobalt, 20~25 parts of calcium oxide, 30~50 parts of dodecyl sodium sulfate, 20~30 parts of benzyl triphenyl phosphonium chloride phosphine,
10~30 parts of barium sulfate, 20~60 parts of dibutyl phthalate, 10~40 parts of polyurethane resin, vinyl bis-stearamides 7
200~300 parts of~8 parts, 10~30 parts of two molybdenum of boronation, 20~40 parts of citric acid, 10~15 parts of glucose and water.
2. it is according to claim 1 to be electromagnetically shielded cobalt sulfide material, it is characterised in that the original including following weight portion meter
Material：70 parts of cobalt sulfide, 22 parts of cobalt oxide, 22 parts of calcium oxide, 40 parts of dodecyl sodium sulfate, 25 parts of benzyl triphenyl phosphonium chloride phosphine,
20 parts of barium sulfate, 40 parts of dibutyl phthalate, 25 parts of polyurethane resin, 7.5 parts of vinyl bis-stearamides, the molybdenum of boronation two
250 parts of 20 parts, 30 parts of citric acid, 12.5 parts of glucose and water.
3. it is according to claim 1 to be electromagnetically shielded cobalt sulfide material, it is characterised in that the original including following weight portion meter
Material：50 parts of cobalt sulfide, 20 parts of cobalt oxide, 20 parts of calcium oxide, 30 parts of dodecyl sodium sulfate, 20 parts of benzyl triphenyl phosphonium chloride phosphine,
10 parts of barium sulfate, 20 parts of dibutyl phthalate, 10 parts of polyurethane resin, 7 parts of vinyl bis-stearamides, the molybdenum 10 of boronation two
Part, 20 parts of citric acid, 10 parts of glucose and 200 parts of water.
4. it is according to claim 1 to be electromagnetically shielded cobalt sulfide material, it is characterised in that the original including following weight portion meter
Material：90 parts of cobalt sulfide, 25 parts of cobalt oxide, 25 parts of calcium oxide, 50 parts of dodecyl sodium sulfate, 30 parts of benzyl triphenyl phosphonium chloride phosphine,
30 parts of barium sulfate, 60 parts of dibutyl phthalate, 40 parts of polyurethane resin, 8 parts of vinyl bis-stearamides, the molybdenum 30 of boronation two
Part, 40 parts of citric acid, 15 parts of glucose and 300 parts of water.
5. it is according to claim 1 to be electromagnetically shielded cobalt sulfide material, it is characterised in that the particle diameter of cobalt oxide is 40~80 micro-
Rice.
6. based on the preparation method for being electromagnetically shielded cobalt sulfide material described in claim 1, it is characterised in that including following step
Suddenly：
Citric acid and glucose are added to the water, are placed on magnetic stirring apparatus and are stirred, persistently stirred after forming solution；
Add cobalt sulfide, cobalt oxide, calcium oxide, dodecyl sodium sulfate, benzyl triphenyl phosphonium chloride phosphine, barium sulfate, O-phthalic
Dibutyl phthalate, polyurethane resin, vinyl bis-stearamides and the molybdenum of boronation two, after 60~120min of stirring, are stood, and filtering is obtained
To filtrate；
Take out in filtrate placement Muffle furnace, be heated to 300~400 DEG C of 1~1.3h of reaction, cooling；
Attrition grinding, sieving, obtains final product.
7. it is according to claim 6 electromagnetic shielding cobalt sulfide material preparation method, it is characterised in that after crushing cross 200
Mesh sieve.
8. it is according to claim 6 electromagnetic shielding cobalt sulfide material preparation method, it is characterised in that described polyurethane
Resin is by organic-silicon-modified.
9. it is according to claim 8 electromagnetic shielding cobalt sulfide material preparation method, it is characterised in that modified polyurethane tree
The preparation method of fat is as follows：By PEPA, different Fo Er diisocyanate, phthalic anhydride, sodium cellulose glycolate and
Hydroxy silicon oil is placed in reactor, and room temperature is cooled to after heating response is complete；N methyldiethanol amine is added, it is heated to 100~
200 DEG C are down to room temperature, add glacial acetic acid to neutralize, and add acetone dilution, vacuum extract obtain final product after acetone solvent it is organic-silicon-modified
Polyurethane resin.
10. it is according to claim 9 electromagnetic shielding cobalt sulfide material preparation method, it is characterised in that described polyester
Polyalcohol, different Fo Er diisocyanate, phthalic anhydride, sodium cellulose glycolate, hydroxy silicon oil and N methyldiethanol amine
Mass ratio is 1：3：5：1：6：3 .
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